20205047501 has 2 divisors, whose sum is σ = 20205047502. Its totient is φ = 20205047500.

The previous prime is 20205047497. The next prime is 20205047573. The reversal of 20205047501 is 10574050202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14383204900 + 5821842601 = 119930^2 + 76301^2 .

It is a cyclic number.

It is not a de Polignac number, because 20205047501 - 2² = 20205047497 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20205047701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102523750 + 10102523751.

It is an arithmetic number, because the mean of its divisors is an integer number (10102523751).

Almost surely, 2^20205047501 is an apocalyptic number.

It is an amenable number.

20205047501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20205047501 is an equidigital number, since it uses as much as digits as its factorization.

20205047501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2800, while the sum is 26.

Adding to 20205047501 its reverse (10574050202), we get a palindrome (30779097703).

The spelling of 20205047501 in words is "twenty billion, two hundred five million, forty-seven thousand, five hundred one".